The summering dunlin is fully molted and all new feathers. We rarely see birds that look like this as very few summer and they molt on the nesting grounds so have a few thousand miles of wear by the time the reach the UTC
The pool by the jetty had lots of trapped and dead fish resulting in lots of piracy. One royal tern got a 3 inch fish and 14 other terns chased it. Turnstones, sanderlings, piping plovers, and several species of herons all fought for food that was readily available.